<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>

  <!-- 准备好一个容器 -->
  <div id="test"></div>

  <!-- 引入react核心库 -->
  <script type="text/javascript" src="../js/react.development.js"></script>
  <!-- 引入react-dom,用于支持react操作DOM -->
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <!-- 引入babel, 用于将jsx转为js -->
  <script type="text/javascript" src="../js/babel.min.js"></script>

  <script type="text/babel">
    class Weather extends React.Component {

      // 初始化状态
      state = { isHot: false, wind: '微风' }

      render() {
        console.log(this)
        const { isHot, wind } = this.state
        return <h1 id="title" onClick={this.changeWeather}> 今天天气很{isHot ? '炎热' : '凉爽'} {wind} </h1>
      }

      // 自定义方法 ----要用赋值语句的形式+箭头函数
      changeWeather = () => {
        console.log(this) //箭头函数的this会捕获其所在的执行上下文 父级作用域
        const isHot = this.state.isHot
        this.setState({ isHot: !isHot })
      }
    }

    ReactDOM.render(<Weather />, document.getElementById('test'))
  </script>
</body>

</html>